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SOARES, D.R. ; SCHWARTZKOPF-GENSWEIN, K.S.; SANT’ANNA, A.C.; VALENTE, T.S.; RUEDA, P.M.; CYRILLO, J.N.S.G.; PARANHOS DA COSTA, M.J.R.; . Lack of the expressive associations between temperament, aggression and weight gain in finishing weight feedlot cattle. In: ASAS – Joint Annual Meeting, 2011, New Orleans, LA, EUA. J. Anim. Sci. Vol. 89, 8 p., Disponível em: < http://jtmtg.org/2011/toc.asp > Acesso em: 05/10/2011. LACK OF THE EXPRESSIVE ASSOCIATIONS BETWEEN TEMPERAMENT, AGGRESSION AND WEIGHT GAIN IN FINISHING WEIGHT FEEDLOT CATTLE. D.R. Soares*1, K. Schwartzkopf-Genswein2, A. C. Sant’anna1, T. da Silva Valente1, P. M. Rueda1, J. N. dos Santos Gonçalves Cyrilo3, and M. J. R. P. da Costa4, 1 Sao Paulo State University, Animal Science Posgraduation, Jaboticabal, Sao Paulo, Brazil, Agriculture and Agri–Food Canada, Lethbridge Research Centre, Lethbridge, Alberta, Canada, 3 Animal Science Institut of Sertaozinho, Sertaozinho, São Paulo, Brazil, 4 Animal Science Department, Sao Paulo State University, Jaboticabal, Sao Paulo, Brazil. 2 Key words: behavior, confinement, reactivity The aim of this study was to determine the relationship between temperament, aggressive behavior and average daily gain (ADG), in feedlot cattle. Behavioral observations were conducted for 10 d (0700 to 1800) using a continuous sampling method. Fifty–3 bulls (35 Nelore and 18 Nelore cross with an average age of 30 ± 3 mo.) were observed in one feedlot pen. The frequencies of 2 types of aggressive behavior were recorded: displacement (DISP; physical contact where the initiator pushed with his head, horn or body resulting in a change in the receivers position) and non-displacement (NDISP; as described above, without any change of the receivers position). Temperament was assessed, in the pen during at weights registers on d 1, d 29 and d 54 at the end of fattening period, using flight distance (FD: proximity (m) to which a stock person could come to an individual animal before it would move away) and flight speed (FS: speed (m/s) at which the animal exited a handling chute). Average daily gain was calculated using animal weights obtained on d 1 and d 54 at the end of the fattening period and Pearson correlation coefficients were estimated for all variables. There were significant positive correlations (P < 0.05) between FD and FS (r = 0.58), DISP and NDISP (r = 0.74) and negative correlations between NDISP and FS (r = –0.29). No correlations (P > 0.05) were observed between NDISP and FD (r = –0.17), DISP and FD (r = –0.06), DISP and FS (r = –0.13), or between ADG and any of the other variables (NDISP: r = 0.07, DISP: r = 0.03, FD: r = 0.09 and FS: r = –0.03). Based on these results we conclude that there is no expressive association between temperament, intraspecific aggression, or ADG. Financial support: CNPq and ETCO Group.